Input Group
A text field with prefix and suffix addons inside one frame.
<TextBox Classes="group" PlaceholderText="Search..." Width="280" HorizontalAlignment="Left">
<TextBox.InnerLeftContent>
<PathIcon Data="{StaticResource UIKit.Icon.Search}" />
</TextBox.InnerLeftContent>
</TextBox>Usage
TextBox Classes="group" is an input group: InnerLeftContent and InnerRightContent are the addons, inside the frame, 6px from the border and 8px from the text. Text addons are muted and medium-weight; a PathIcon or a Button works as well. A Button in the group gets the group's button look on its own: a compact ghost button tinted with muted on hover and press, square with icon-only. The frame's border and background move to their new color over 120ms.
A multi-line group is AcceptsReturn="True", as for the Textarea. An invalid group (Avalonia's :error, set through DataValidationErrors) shows the danger border and ring, even when unfocused or disabled; disabled, the whole group fades to half. Sizes: xsmall, small, large (medium is the default).
Examples
Text addons on both sides, and a read-only field with a suffix.
<StackPanel Spacing="12" Width="280" HorizontalAlignment="Left">
<TextBox Classes="group" Text="example" InnerLeftContent="https://" InnerRightContent=".com" />
<TextBox Classes="group" Text="Read only" InnerRightContent="Saving" IsReadOnly="True" />
</StackPanel>Buttons as the suffix: a text button, an icon-only one, and a multi-line group with a Send button.
<StackPanel Spacing="12" Width="280" HorizontalAlignment="Left">
<TextBox Classes="group" Text="avalonia">
<TextBox.InnerRightContent>
<Button Content="Clear" />
</TextBox.InnerRightContent>
</TextBox>
<TextBox Classes="group" Text="avalonia">
<TextBox.InnerRightContent>
<Button Classes="icon-only">
<PathIcon Data="{StaticResource UIKit.Icon.Close}" />
</Button>
</TextBox.InnerRightContent>
</TextBox>
<TextBox Classes="group" AcceptsReturn="True" MinLines="3" MaxLines="3" PlaceholderText="Write a message">
<TextBox.InnerRightContent>
<Button Content="Send" />
</TextBox.InnerRightContent>
</TextBox>
</StackPanel>An invalid group and a disabled one. The demo sets DataValidationErrors.Errors from a static helper that holds one validation message; an app gets its errors from its bindings' validation instead.
<StackPanel Spacing="12" Width="280" HorizontalAlignment="Left">
<TextBox Classes="group" Text="not an email"
DataValidationErrors.Errors="{x:Static demos:ValidationErrors.InvalidEmail}">
<TextBox.InnerLeftContent>
<PathIcon Data="{StaticResource UIKit.Icon.Search}" />
</TextBox.InnerLeftContent>
</TextBox>
<TextBox Classes="group" PlaceholderText="Search..." IsEnabled="False">
<TextBox.InnerLeftContent>
<PathIcon Data="{StaticResource UIKit.Icon.Search}" />
</TextBox.InnerLeftContent>
</TextBox>
</StackPanel>Not covered
BlockStart/BlockEndaddons above and below the field.